Yes Moose On The Loose, of course it is interesting, I think with one divider circuit frequency we can get more frequency.

Today I was testing the Generator wave program siggen, but when the frequency is over to 4 Khz the sine wasn't too clean.

When you set up the sound hardware, you can set the sampling rate. Since almost all sound cards will do fairly fast rates, I suggest moving up to a faster rate. This gives you more points on the curve.

On cheap sound cards, when you get above about 2KHz a full scale sine wave gets a bit of added distortion because the hardware has a slew rate limit. As you start to get anywhere near the limit, the distortion starts to rise.

Quote:

Is sure we can improve the Generator and Oscilloscope with external circuit.

The next day I'll put the pet of siggen.

Any idea is welcome.

See you Moose On the Loose.

An external circuit can be used to "mix down" high frequencies to lower frequencies so that the sound card can be used to digitize bands at high frequencies rather than trying to go for getting a wider bandwidth.

Code:

I = Signal * cos(1MHz)
Q = Signal * sin(1MHz)

Filter I and Q
Connect to Left and Right microphone.

Signals within about 10KHz each way from 1MHz will appear on the Left and Right as signals from DC to 10KHz. Above and below will differ on the phase relationship. The idea I was thinking about here is to make a circuit that is controlled by some other path to set what I called 1MHz to various frequencies to be able to do things like make an RF spectrum.

Another thought is to repeat the experiment many times and tile together the FFTs to make the FFT of the whole signal and then do the iFFT to get the time domain. It requires that the phase of the sin() and cos() generators be based on the start of the "experiment" as their time zero for each run.

Hi gents! I find any applications like this interesting. A while back, I installed oscilloscope and spectrum analyser apps for my phone, but wanted something on a PC. I resurrected an old Sony Vaio (1 GHz AMD Athalon with a floppy drive!) and put Puppy Slacko on it.

I have just install the xscope 2.0 application and so far it works nicely - thanks! Just one question so far: Are the other input channels for if you have more than one microphone? So, for this old beast, one mic, one channel.

I intent to use for amateur radio stuff.

I'm on the look out for a spectrum analyser also.

I'm hoping to knock up something that will allow it to monitor low HF, say upto 10 MHz, with some sort of frequency converter. I'll keep you posted.

You seem to be a clever man,
when you write the pet for Baudline,
could you also look closely into the
original code and find a way to auto-trigger
the "display - waveform" or oscilloscope
to give a stationary waveform.

I noticed this years ago when I was testing
a homemade audio oscillator and found
it wasn't possible to make the sine wave
display still or locked.

Further to Baudline and on the subject of audio spectrum analysers, yes there are any number of them to be found online,
mostly those in Windows that have to be installed.

I stumbled upon this nice "bare bones" Windows one (324k),
included in a web page trio of audio tools that can be
carried, portable on a flashdrive if you like.
It and they are exe file(s) and just run when clicked,
no need to be installed.

Found on:
http://www.techmind.org/audio/index.html

So I just wondered, if for the compiling folk around, they might
also be useful as convertible to pets, for Puppy fans.

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